2 * Copyright (C) 2010 David Conrad
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "libavcodec/bytestream.h"
26 static int skeleton_header(AVFormatContext
*s
, int idx
)
28 struct ogg
*ogg
= s
->priv_data
;
29 struct ogg_stream
*os
= ogg
->streams
+ idx
;
30 AVStream
*st
= s
->streams
[idx
];
31 uint8_t *buf
= os
->buf
+ os
->pstart
;
32 int version_major
, version_minor
;
33 int64_t start_num
, start_den
;
34 uint64_t start_granule
;
35 int target_idx
, start_time
;
37 st
->codec
->codec_type
= AVMEDIA_TYPE_DATA
;
39 if ((os
->flags
& OGG_FLAG_EOS
) && os
->psize
== 0)
45 if (!strncmp(buf
, "fishead", 8)) {
49 version_major
= AV_RL16(buf
+8);
50 version_minor
= AV_RL16(buf
+10);
52 if (version_major
!= 3 && version_major
!= 4) {
53 av_log(s
, AV_LOG_WARNING
, "Unknown skeleton version %d.%d\n",
54 version_major
, version_minor
);
58 // This is the overall start time. We use it for the start time of
59 // of the skeleton stream since if left unset lavf assumes 0,
60 // which we don't want since skeleton is timeless
61 // FIXME: the real meaning of this field is "start playback at
62 // this time which can be in the middle of a packet
63 start_num
= AV_RL64(buf
+12);
64 start_den
= AV_RL64(buf
+20);
66 if (start_den
> 0 && start_num
> 0) {
68 av_reduce(&start_time
, &base_den
, start_num
, start_den
, INT_MAX
);
69 avpriv_set_pts_info(st
, 64, 1, base_den
);
71 st
->start_time
= start_time
;
73 } else if (!strncmp(buf
, "fisbone", 8)) {
77 target_idx
= ogg_find_stream(ogg
, AV_RL32(buf
+12));
78 start_granule
= AV_RL64(buf
+36);
80 av_log(s
, AV_LOG_WARNING
, "Serial number in fisbone doesn't match any stream\n");
83 os
= ogg
->streams
+ target_idx
;
84 if (os
->start_granule
!= OGG_NOGRANULE_VALUE
) {
85 av_log(s
, AV_LOG_WARNING
, "Multiple fisbone for the same stream\n");
88 if (start_granule
!= OGG_NOGRANULE_VALUE
) {
89 os
->start_granule
= start_granule
;
96 const struct ogg_codec ff_skeleton_codec
= {
99 .header
= skeleton_header
,